4-D-M Machine 100 quick change tool post lathe tool holder Machinist Shop. Comes with a T-slot nut and a homemade aluminum spacer. The nut has some harmless surface rust. I don't see anything obviously wrong with the quick change post other than the scuffs and nicks typically found on used machine tooling of this nature.   

   Looks to be an Aloris Larger D Size Piston Style Quick Change Tool Post W/ DA Size Holders D2 & Shop made tool block. Tag is missing from tool post but its an older piston style Aloris with the round pistons. Be sure to view our other items for more great tooling finds. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Quick Change Tool Post". The seller is "zwmcquig" and is located in this country: US. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, ...